@article{DAN_1971_196_2_a7,
     author = {L. Z. Kruglyakov},
     title = {On the projective differential geometry of families of multidimensional planes},
     journal = {Doklady Akademii Nauk},
     pages = {282--284},
     publisher = {mathdoc},
     volume = {196},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_2_a7/}
}